Abstract

Aerosol and gaseous pollution measurements were carried out at an urban background site in thesouth of Italy located near an industrial complex. Collection of 24 h samples of PM10 and PM2.5and successive chemical quantification of metals were performed. Data were compared withmeasurements taken at a suburban background site, located at 25 km distance. The comparisonshowed the presence of an industrial contribution with a well defined chemical emission profile,similar, in terms of metals content, to urban emissions. As this made difficult the quantitativecharacterisation of the contribution of the two sources to atmospheric PM, a statistical method basedon the treatment of data arising from high temporal resolution measurements was developed. Datawere taken with a micrometeorological station based on an integrating nephelometer (Mie pDR-1200) for optical detection of PM2.5 concentration, with successive evaluation of vertical turbulentfluxes using the eddy-correlation method. Results show that the contribution from the two sources(urban emissions and industrial releases) have a very different behaviour, with the industrialcontribution being present at high wind velocity with short concentration peaks (average duration4 min) associated to strong positive and negative vertical fluxes. The estimated contribution to PM2.5is 2.3% over long-term averages. The urban emissions are mainly present at low wind velocity, withlonger concentration peaks in the morning and late evening hours, generally associated to smallpositive vertical fluxes. The characterisation of the contribution was performed using depositionvelocity Vd that is on average 3.5 mm s1 and has a diurnal pattern, with negligible values during thenight and a minimum value of around 9 mms1 late in the afternoon. Results show a correlationbetween Vd, friction velocity and wind velocity that could be the basis for a parameterisation of Vd to beused in dispersion codes.

Autore Pugliese

• Donateo Antonio , Cesari Daniela , Contini Daniele

Tutti gli autori

• Contini D.; Donateo A.; Cesari D.; Belosi F.; Francioso S.

Titolo volume/Rivista

Journal of environmental management

Anno di pubblicazione

2010

ISSN

0301-4797

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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